Well-drilling tool.



R.-L. PORTER & G. D. WATSON.

WELL DRILLING TOOL. APPLIOATION FILED MAE. 2, 1911.

Patented 'Mar. 5, 1912.

re wig 1wv t m m p ROBERT L. PORTER AND GEORGE D. VIATSON, 01 L03 AIJGELES, CALIFORNIA.

WELL-DRILLING TOOL.

To all whom it may concern:

Be it known that we R BERT L. PORTER and GEORGE D. VVATSON, citizens of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in ell-Drilling Tools, of which the following is a specification.

This invention relates ,to improvements in well drilling tools, and particularly to that class of tools known as casing shoes, and is particularly adapted for use in wells which are drilled by the vertical reciprocation of the tool by means of any suitable machinery and has particular relation to the cutting portion of the mechanism, the

said cuttingtportnin being adapted to out the hereof the well the proper size and to packthe material at the sides in the process of producing the bore. 1

It is a further ob'ect of the invention to provide a tool in which the cuttingdevice or shoe is connected with the sectional easing by which it is lowered into the well and reciprocated, not only by the usual screw threads but also by an additional wedging collar adapted to prevent any movement or twisting strain between the cutting point and the casing carrying the same.

In the drawing forming a part of this f specifieation, Figure 1 is a side elevation ot' the improved boring tool "forming the subject matter of the present invention. Fig. 2 is'a'vertical central longitudinal sectional view through the same. Fig. 3 is an elevation of the cutting end of the tool.

I The details of the invention will now be more specifically described, reiterence being had to th accompanying; drawing in which 1 indicates the body portion of the drilling tool, 2 the cutting or excavating points and 3 a portion of the hollow casing or stem carrying the cutting tool.

The-drilling tool is preferably made cylindrical in shape and slightly enlarged at its lower end as will be clearly seen by reference to Figs. 1. and 2. The tool is usually made hollow and is provided with in terior screw threads at 4 adapted to engage 'corresponding exterior screw threads 5 formed upon the lower end ofthe supporting and operating casing 3. The lower end of the said tool is thickened sufficiently to bring its inner surface flush with the inner Specification of Letters Patent.

surface of the casing 3 as shown in Fig. 2. The lower end of the tool is preferably curved inwardly to form a portion of. a spherical surface giving the inner side of thetocthed drilling end of the tool a somewhat hollow shape as clearly shown in Fig. 2. The teeth 2 are formed by cutting slot-s as 6 into the lower edges of the tool. The said slots are cut baekwardly from the edges thereof a sutlicientdistance to form. inclined material tainping faces 7 between the adjacent teeth. The said notches 6 forn1- ing the teeth are preferably made of the same width and are usually curved at their inner corners at 8, the shape of said slots being such that there is no chance for the material cut by the teeth to pack and become wedged in place in the notches. Thus the tool thoroughly clears itself from thecuttings produced by its operation.

The shape of the teeth with the notches between it having the inclined taniping faces 7 makes the tool especially well adapted for use in more or less. soft or sandy soils, the

outer face of the teeth cutting and trimming the'bore of the well as indicated by dotted lines in Fig. 1 while the material between the teeth is forced outwardly and tamped and packed tightly flush with the inner face of the bore of the well, thus largely obviating the tendency of the soft or sandy ma tcrials to tumble inwardly after the tool has passed a given point. The outer faces of the teeth 2 are preferably madeparallel with the inner surfaces oi the bore at least back to the point where the inclined face 7 reaches the periphery of the tool. In this way the points 2 are adapted to cut the full diameter desired in producing the bore of the well and the inclined tainping faces 7 will pack the material even with the bore produced by'the outer faces of the said teeth. The construction of the upper end of the tool 1 is also importantsince it prevents the likelihood of breaking the lower end. of the easing 3 which carries the tool. The socket for receiving the .end of the tool 3 is carried well into the upper end of the said tool 1 so that the threaded portion is nearer the lower end of the tool than the upper end. The upper end of the bore of the tool is then provided with an outward flare as at 9, thus leaving a wed e shaped anu illar.

lPatented Mar. 5,1912, Application filed March 2, 1911. Serial No. 611,752.

' or wedge is forces down tightly between and after the said casing has been screwed I tightly into the tool 1, the said beveled ring provided with straight outer surfaces parallel with the axis of the tool and curved lower edge, and provided with rearwardly the casing and the upper edge of the tool as indicated in Figs. 1 and 2 of the drawing. In this way the connection between the'casing 3 and the boring tool is made absolutely positive I and firm an inner surfaces and inclined tamping spaces to be uneven and 1t 15 diificult to form a snu same even with the bore of the well proand tight mint between the same and the duced by the tool. boring tool and when the boring tool en 3. -A drilling tool comprising a body porthe side only it is apt to be twisted upon the casing 3. The using of the wedge 10 at the upper end of the tool prevents any rocking movement due to the unevenness of the materials used and greatly strengthens the sonnection between the parts.

By employing the split ring wedge the Wedge can accommodate itself to any unevenness'in the parts and can be made to fit inner inclined "surfaces, outwardly and upwardly inclined tamping surfaces being arranged between the said teeth.

In witness that we claim the foregoing we have hereunto subscribed our names this 24th day of February, 1911.

more snugly in the flaring portion 9 of the 'tooll. l

1;What we claim is VVitnesses: I

'. drilling tool comprising a body por- EDMUND AQSH USE,

tion' hating teeth formed at its lower edge EARLE R. Penman. 

